It's funny how often this comparison gets made, when the situations are so completely different. The only thing they have in common is that they both have great stuff and both stunk in April.
Perez is hurt. Perez has problems with his mechanics. Perez can't throw strikes. This is not a recipe for a turnaround, but the payoff is too high on this guy. There is a slim chance he could resemble the pitcher of last year, and for that reason alone, he is stashed on my bench. Unless you're ultra-confident he won't turn it around, you don't want to be the guy that dropped Santana last year (sorry ocmusicjunkie; you are applauded for admitting your mistake though. I made some bad ones last year too: dropping Brian Roberts, Mark Loretta, Hideki Matsui in a keeper league).

No comparison to the situations. Santana was coming off elbow surgery in the offseason and some sources said he was tipping his pitches. Even during the rough start, however, he'd be lights-out for 4-5 innings, then put runners on and give up jacks for big innings.
Ollie had a sharp regression to his pre-control days, and is hurt to boot. He could turn it around, but it'll be a gradual process ... and he has to get healthy first.

Oliver Pere, skipped twice due to shoulder stiffness, is scheduled to start against the Rockies on Saturday.
Assuming his bullpen session tomorrow goes well, of course. ''The mechanical things were causing the strain on the shoulder,'' manager Lloyd McClendon said. ''[Pitching coach Spin Williams] detected some things on film, and he went out and worked on them. We saw immediate results, and we will continue to build off those things.'' Only because he's facing the Rockies in Pittsburgh, Perez is probably worth having active on Saturday.